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Software ==>	SQL (129 exercises)
Topic ==>	Setting criteria using WHERE (5 exercises)
Level ==>	Harder than average
Subject ==>	SQL training

Use wildcards, AND, IN and OR to get a list of events to do with water

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

Before you can do this exercise, you'll need to download and unzip this file. Once you've done this:

Go into SQL Server Management Studio;
Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
Execute this script.

This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).

First show a list of all events which might have something to do water. The Wise Owl interpretation of this is that one or more of the following is true:

They take place in one of the island countries (8, 22, 30 and 35, corresponding to Japan, the Marshall Islands, Cuba and Sri Lanka respectively)
Their EventDetails column contains the word Water (not the text Water, but the word)
Their category is number 4 (Natural World)

This should return 11 rows. Now add a criterion to show only those events which happened since 1970 (you may need to use parentheses to get this to give the correct answer).

Here's what you should see as a result:

The final results from running this complicated query.

Save this as Somewhat contrived, then close it down.

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.

You can find other training resources for the subject of this exercise here:

This page has 9 threads

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From:	e-emam14
When:	16 Aug 23 at 20:22

Reply to e-emam14

SELECT eventname, eventdetails
FROM tblevent
WHERE countryid =8

AND countryid =22

AND countryid =30

AND countryid =35
OR eventdetails LIKE '%water%'
OR categoryid =4
AND eventdate <= '1970-1-1'

From:	niflheimis
When:	16 Feb 22 at 20:44

Reply to niflheimis

Hi,

Why is the parenthesis necessary? I did notice that without it the "AND EventDate >= '19700101'" doesn't work, but I don't understand why.

I would appreciate an explanation :)

From:	Andy B
When:	17 Feb 22 at 12:06

Reply to Andy B

Suppose you want to pick out all the pets from a pet shop which are fluffy or scaly and which have 4 legs. If your criteria reads:

Fluffy or Scaly and 4 legs

This might be interpreted as giving all pets which are either fluffy or which are 4-legged and scaly. So whereas you wanted fluffy or scaly quadrupeds, your query would give you all fluffy animals, regardless of their number of legs. Putting brackets in makes the query do what you want:

(Fluffy or Scaly) and 4 legs

From:	ShukiMolk
When:	11 Apr 20 at 02:53

Reply to ShukiMolk

Actually, there is a small bug with previous answers. When using this criterion:

(EventDetails) like '% water %

we get indeed events that have the word 'water' in them (with space before and after the word 'water'), but we leave out events that begins or ends with the word 'water'. True, there are none in the database, but if we add them, we could see that they are left out.

Try adding these events:

INSERT INTO [tblEvent]
VALUES ('Event that BEGINS with water', 'Water falling from the sky', GETDATE(), 1, 1),
('Event that ENDS with water', 'There is no more water', GETDATE(), 1, 1)

There should be 7 rows now, shouldn't there?

In order to "capture" also events that start or end with the word 'water' we should add these conditions:

OR [EventDetails] LIKE 'water %'
OR [EventDetails] LIKE '% water'

Hope this helps.

P.S. In order to remove these 2 events that we added, execute the following script:

DELETE FROM [tblEvent]
WHERE
[EventDetails] LIKE 'Water falling from the sky'
OR
[EventDetails] LIKE 'There is no more water'

From:	Onette
When:	22 Feb 20 at 13:19

Reply to Onette

Select EventName, EventDetails, EventDate
From tblEvent
Where (CategoryID = 4 or CountryID in (8,22,30,35) or lower (EventDetails) like '%water %')
and Year(EventDate)>1970 ---- the year is extracted with function YEAR()

From:	Priyanshu
When:	22 Dec 19 at 20:36

Reply to Priyanshu

SELECT EventName, EventDetails, EventDate
FROM tblEvent
WHERE (CategoryID = 4 OR CountryID IN (8,22,30,35) OR EventDetails LIKE '% WATER %')
AND DATEPART(YEAR, EventDate) > 1970;

From:	Shubham
When:	16 Feb 21 at 17:18

Reply to Shubham

select * from [dbo].[tblEvent]
where ([CountryID] in (8,22,30,35) or
[EventDetails] like '%water%' or
[CategoryID]=4) and
DATEPART(YEAR,EventDate) >1970;

From:	AceAxe
When:	24 Jun 19 at 09:57

Reply to AceAxe

These exercises are fascinating!

From:	rasheedshd
When:	24 Sep 18 at 21:17

Reply to rasheedshd

I am not able to rin this, can anybody help.

select EventName, eventdetails, EventDate
from tblEvent
where CountryID in (8,22,30,35)
or eventdetails like '%water%' or
CategoryID = 4
and eventdate > 1970-01-01

I am getting this error message:

Operand type clash: date is incompatible with int

From:	Andrew G
When:	25 Sep 18 at 07:31

Reply to Andrew G

Hi, try writing the date within a set of single quotes, like this:

'1970-01-01'

I hope that helps!

From:	Kareem44
When:	07 Sep 17 at 10:03

Reply to Kareem44

cannot solve it

select EventName, EventDetails, EventDate from tblEvent where (CountryID = 8 or CountryID = 22 or CountryID = 30 or CountryID = 35) or EventDetails = '%water%' or CategoryID = 4 and year(EventDate) >= 1970

From:	Andy B
When:	07 Sep 17 at 16:47

Reply to Andy B

You need to put LIKE and not =:

EventDetails LIKE '%water%'

This will show rows where the event details match the pattern contained in the text string.

From:	eric
When:	05 Nov 17 at 07:27

Reply to eric

Correct answer is:

EventDetails like '% water %'

with spaces around. You are looking for the word water , not any text with water in it.

Full query:

select * from tblEvent
where (CountryID in(8,22,30,35) or
EventDetails like '% water %' or
CategoryID = 4) and EventDate > '1970-01-01'

From:	piresmdb
When:	18 Jul 17 at 09:55

Reply to piresmdb

Combine criteria to show possibly watery post-1970 events!

Thee are only 4 events under the CategoryID 4. How come you have five in your solution?

From:	Andrew G
When:	30 Jul 17 at 10:02

Reply to Andrew G

The clue is in the question!

"one OR more of the following is true"

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SQL EXERCISES

SQL EXERCISES

Use wildcards, AND, IN and OR to get a list of events to do with water

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